The Koi district (Nishi-Hiroshima) of Hiroshima City, where Niwayoshi-Kaen has been located for more than 400 years since the Edo period, is said to be the birthplace of bonsai, and even today there are many landscaping businesses in the area. The garden's grounds are lined with a variety of trees, including pine trees, cherry trees, and autumn leaves, as well as many potted plants and bonsai under care.
In 1619, when Nagaakira Asano came to Hiroshima as the third lord of Hiroshima Castle from Kishu, Botanya(Peony)-Jiroemon, a peony shop owner from Osaka, followed the lord to produce peonies. And it was Koi that was selected as a suitable site for peony production. This led to the cultivation of plants, bonsai, and flowering plants from the mid-Meiji period (about 260 years later), and by the Taisho and Showa periods, Koi became one of Japan's leading production centers for these products. According to one theory, the so-called "bonsai" also spread from the Koi district to the rest of the country. Botanya returned to Osaka, and his son, Uekiya(gardener)-Jiroemon, who is a gardener, settled in Koi and became the first gardener.

Hiroshima bonsai techniques include the granite soil formed by the granitic nature of Hiroshima. This soil, which is well drained and poor in nutrients, is unsuitable for tree growth. However, because the purpose of the Koi was to transplant trees, they developed techniques to control the growth of trees and produce garden plants as works of art. This allows Hiroshima bonsai to be beautifully detailed and precise. In addition, flower shears produced with superior iron from tatara iron, as typified by Aki-tori(10 Profitable Items), were ideal for tailoring. The mastery of craftsmanship by artisans of both tatara and bonsai existed in the essence of the art and deepened the techniques.

Today, the value of Japanese bonsai is recognized and spreading around the world under the name of BONSAI. Since the founding of the "Hyakkaen" garden of the Asano clan 400 years ago, Hiroshima has certainly had a spectacular garden, flowering plant, and bonsai culture as a key location in San-you region, centered on the castle town. Koi, the center of this culture. To utilize and pass on to the next generation the skills and techniques of the artisans that have been passed down from generation to generation in this region.The kanji for "裁(SAI)" in bonsai has been changed to "綵 (SAI)" and the Hiroshima Bonsai has begun to breathe new life into the word "BONSAI". The word "綵 (SAI)" is used to describe beautiful silk fabrics, and bonsai is the art of creating a world on a tray. Using the nature of greenery itself, various traditional cultures and the latest technology are combined and woven together on the tray to create a new world and beautiful textiles.This is the concept behind "広島盆綵 -Hiroshima BONSAI," and we believe that the works and new objects produced will permeate both domestically and internationally, creating values that are universally accepted.
Hiroshima bonsai continues to evolve today while continuing to carry on its traditions.